#! / bin / bash
# jc.sh
# Calculate the Bash Shell code
# 张晓辉
T = 1
s = 1
IF [$ 1 -ge 13]
THEN
Echo INPUT MUST Be Less Than 13.
Else
While [$ T -LE $ 1]
DO
Let s = s * t
Let t = t 1
DONE
Echo $ 1! Equals $ s.
Fi
